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XSLT How to add Logic

Answer 1

+1 A:

You can add if/else if logic to XSLT with <xsl:if>

There is also the ability to have something like a switch statement with <xsl:choose>, which includes the capability do do 'else' behaviour.

These constructs take a test attribute, in which you specify the condition. Here's a nice writeup on useful getting-started tests.

It's really something you have to play with to get used to, but these website links will give you a great start.

Example: given your document a template like:

<xsl:template match="/">
    <xsl:for-each select="events/event">
        <xsl:choose>
            <xsl:when test="type/text() = 'Processed'">
                <xsl:value-of select="result"></xsl:value-of>
            </xsl:when>    
        </xsl:choose>
    </xsl:for-each>
</xsl:template>

Will produce the text 'Sucess'.

Brabster 2009-09-22 18:38:39

However, to get if/*else* logic in XSLT 1.0 you would typically use `xsl:when` and `xsl:otherwise` (`xsl:if` does not have an else branch).

0xA3 2009-09-22 18:40:32

Please provide a quick example that checks for the existance of an element with certain values?

JL 2009-09-22 18:41:45

Note using the text() function there - if you don't do that, the text you are checking is the concatenated value of all the child elements of the element in question. Confuses the hell out of people.

Brabster 2009-09-22 18:52:22

<xsl:choose> <xsl:when test="events/event[type='Processed']">  </xsl:when> <xsl:otherwise>  </xsl:otherwise></xsl:choose>I actually don't think you want to use the xsl:for-each here, because you are concerned if there is "at least one" event that matches a condition, correct?

carolclarinet 2009-09-22 21:44:16

Answer 2

+1 A:

Untested, and I'm a bit confused by the logic you're trying to implement, but try starting with this:

<xsl:template match="/">
  <table>
    <xsl:apply-templates select="events/event" />
  </table>
</xsl:template>

<xsl:template match="event">
  <xsl:if test="type = 'Processed'">
    <tr>
      <td>
        <xsl:value-of select="result" />
      </td>
    </tr>
  </xsl:if>
</xsl:template>

Keith 2009-09-22 18:41:32

Like @JBKing says, if you need an "else" condition, you will need to use <xsl:choose>

Keith 2009-09-22 18:45:24

Answer 3

+1 A:

xsl:choose is another option. From that link:

<xsl:template match="/">
  <html>
  <body>
    <h2>My CD Collection</h2>
    <table border="1">
      <tr bgcolor="#9acd32">
        <th>Title</th>
        <th>Artist</th>
      </tr>
      <xsl:for-each select="catalog/cd">
      <tr>
        <td><xsl:value-of select="title"/></td>
        <xsl:choose>
          <xsl:when test="price &gt; 10">
            <td bgcolor="#ff00ff">
            <xsl:value-of select="artist"/></td>
          </xsl:when>
          <xsl:otherwise>
            <td><xsl:value-of select="artist"/></td>
          </xsl:otherwise>
        </xsl:choose>
      </tr>
      </xsl:for-each>
    </table>
  </body>
  </html>
</xsl:template>

The xsl:if doen't have an else functionality.

JB King 2009-09-22 18:42:26

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